ML20079N231
| ML20079N231 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/25/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8401300140 | |
| Download: ML20079N231 (2) | |
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C TENNESSEE' VALLEV AUTH'ORITY CH ATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II I,' UEuah55 h b84 BLRD-50-438/84-03 BLRD-50-439/84-03 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - TIME SPAN FOR TEMPERATURE SWITCH 2
RESPONSE - BLRD-50 438/84-03, BLRD-50-439/84 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector C. A. Julian on December 27, 1983 in accordance with 10 CFR 50.55(e) as NCR BLN BLP 8334. Enclosed is our first interim raport. We expect to submit our next report by Au6ust 15,1984.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Ir.spection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8401300140 840125 PDR ADOCK 05000438 l
PDR S
OFP1CIAL COPY Stz 7 Ife An Equal Opportunity Employer J
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 TIME SPAN FOR TEMPERATURE SWITCH RESPONSE BLRD-50-438/84-03, BLRD-50-439/84-03 NCR BLN BLP 8334 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency ASCO ambient monitoring temperature switches OSA-ITS-609A-A through 609D-A, 265A-A, 265B-A, 266A-B, 266B-B, and 610A-B through 6100-B were procured to detect and initiate. isolation of pipe breaks in the auxiliary steam system which is located throughout the Auxiliary Building common zone. The existing analysis to determine the environmental response of the common zone due to postulated pipe breaks in the system was performed before procurement of the switches and was based upon incorrect switch response charac teristics. An analysis using the correct switch response characteristics predicts environmental temperatures which are in excess of the qualification temperature of the affected safety-related equipment.
Interim Progress TVA is currently considering the replacement of the existing switches with fast-acting ambient monitoring switches. Our next report will detail efforts taken in this mgard.
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